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Leap Day is coming. Marvin Samuel Tolentino Pineda/iStock, via Getty images

Why does a leap year have 366 days?

Humans have synced their calendars to the sun and moon for centuries, but every so often, these systems need a little correction.
Tardigrades have extraordinary survival skills. Dotted Yeti/Shutterstock

Could tardigrades have colonized the Moon?

Tardigrades are tiny animals known for their extraordinary survival skills, but are they tough enough to survive a space-probe crash and conditions on the Moon?